Devices on the SCADA network communicate exclusively at Layer 2. Which of the following
should be used to prevent unauthorized systems using ARP-based attacks to compromise the
SCADA network?
A.
Application firewall
B.
IPSec
C.
Hardware encryption
D.
VLANS
Explanation:
In other words, this question is asking you what choice is running on layer 2?
A. Application firewall – Layer 7
B. IPSec- Layer 3
C. Hardware encryption- Layer 1
D. VLANS- Layer 2
The correct answer is D. In fact, you can assign SCADA network into a separate VLAN.
https://www.quora.com/What-OSI-layer-does-IPSec-work-on
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Agreed. Definitely D. Good explanation.
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